Mbth: elninophenomenon
Content:
El Nino phenomenon, also known as El Nino current, is a large-scale interaction between the ocean and the atmosphere in the equatorial Pacific.
Climate phenomenon caused by loss of balance after action. Under normal circumstances, the monsoon ocean in the tropical Pacific region
Ocean currents flow from America to Asia, keeping the surface of the Pacific Ocean warm and bringing tropical rainfall to Indonesia. But this
This pattern is disturbed every 2-7 years, the wind direction and ocean current are reversed, and the heat flow in the surface layer of the Pacific Ocean is turning.
And went eastward to America, taking away tropical rainfall, and the so-called "El Ni? o phenomenon" appeared.
The word "El Nino" comes from Spanish, which means "El Nino". /kloc-at the beginning of the 0/9th century, in South America.
In Spanish-speaking countries such as Ecuador and Peru, fishermen find that every few years, from 10 to.
In March of the following year, there will be a warm current moving southward along the coast, which will obviously increase the surface seawater temperature. South America. See AMERICA
The Peruvian cold current originally prevailed on the east coast of Europe and the Pacific Ocean, and the fish that moved with the cold current made the Peruvian fishing ground become the world.
One of the three largest fishing grounds in the world, but as soon as this warm current appears, a large number of fish who like cold water will die, causing fishermen.
Suffer extinction. Because this phenomenon is often the most serious around Christmas, without it, it will suffer from natural disasters.
Helpless fishermen call it the son of God-the holy baby. Later, in science, the word was used to mean secret.
Thousands of kilometers of sea surface temperature in the East Pacific Ocean near Shandong and Ecuador have become unusually warm. When this happens,
At birth, a wide range of seawater temperatures can be 3-6 degrees Celsius higher than normal. The water temperature in the vast waters of the Pacific Ocean is rising.
High, changing the traditional equatorial airflow and southeast trade winds, leading to global climate anomalies.
The basic feature of El Nino phenomenon is that the sea surface temperature along the Pacific coast rises abnormally and the sea water level rises.
And form a warm current flowing southward. It turns the waters of the East Pacific Ocean, which used to be cold water, into warm water, forming a knot.
As a result, tsunamis and storms caused drought in some areas and excessive rainfall in others.
Phenomenon.
The whole process of El Nino is divided into occurrence period, development period, maintenance period and attenuation period, which generally lasts for one year.
Yes, the change of atmosphere lags behind the change of seawater temperature.
Today, with the highly developed meteorological science, people have understood that the central Pacific Ocean is the summer in the northern hemisphere.
The main driving force of seasonal climate change. There is usually a northward secret in the Pacific Ocean on the west side of the South American continent.
Shandong cold current, part of which becomes equatorial current, moves westward. At this time, it blows westward along the sea near the equator.
The wind makes the warm current accumulate on the west side of the Pacific Ocean, and the low-level cold sea water rises to the east side, which makes the western Pacific Ocean Philippine.
The sea temperature south of Payne and north of New Guinea is rising, and the same latitude is called "equatorial warm pool".
The sea temperature in the east is relatively low. There is also a temperature difference in the atmosphere over the two sea areas, and the temperature in the east is low.
The air pressure is high, and the cold air flows westward after sinking; The temperature in the west is high and the air pressure is low, and the hot air turns after rising.
In the east, even in the middle of the Pacific Ocean, a sea-level cold air flows westward, and high-altitude hot air flows eastward.
The atmospheric circulation of ocean current (Walker circulation) forms southeast trade winds near sea level. But some
This air pressure difference is sometimes lower than the multi-year average, and sometimes it increases. This phenomenon of atmospheric change is called
Southern Oscillation. In 1960s, meteorologists found that El Nino was closely related to the Southern Oscillation, and the pressure was different.
When it decreases, the El Nino phenomenon appears. After El Nino, the Pacific Ocean changed from east to west due to the warm current.
The westerly monsoon is greatly weakened, which makes the atmospheric circulation change obviously and has a great influence on the countries along the Pacific Ocean.
Climate, originally wet areas are dry, and floods occur in arid areas. When this pressure difference increases, seawater
The temperature will drop abnormally, which is the so-called "La Nina phenomenon".
After the 1960s, with the progress of observation means and the development of science, people discovered Earle.
Nino phenomenon not only appears in the coastal areas of South America and other countries, but also spreads all over the eastern Pacific along the equator.
And Pacific Rim countries; In some years, even the Indian Ocean coast will be affected by climate anomalies caused by El Nino.
The impact of a series of natural disasters. Generally speaking, it makes the climate in the southern hemisphere drier and hotter, and makes the northern hemisphere drier and hotter.
The climate is colder and wetter.
In recent years, scientists have put forward some new explanations for the El Ni? o phenomenon, that is, El Ni? o may be related to
The submarine earthquake, the change of seawater salinity and the change of atmospheric circulation are related.
El Nino occurs periodically, about once every 2-7 years. To 1997
In the past 20 years, El Nino occurred in 76-77, 82-83, 86-87,
9 1-93 and 94-95 appeared five times. Earle appeared during 1982- 1983.
Nino phenomenon is the most serious one since this century, causing about 1500 deaths, 8.
00 billion dollars in property losses. After entering the 1990s, with global warming, the El Ni? o phenomenon appeared.
More and more frequently.
Due to the development of science and technology and the attention of countries all over the world, scientists have taken a series of measures to deal with the El Ni? o phenomenon.
Scientific research activities such as train forecasting model, ocean observation and satellite reconnaissance, and air-sea coupling have deepened the understanding of this gas.
Understanding of abnormal phenomena. First of all, people realize that the physical process of El Ni? o phenomenon is the interaction between the ocean and the atmosphere.
The result of the action, that is, the change of ocean temperature is related to the atmosphere. So after the 1980 s, scientists put
El Nino phenomenon is called "Anceaux" phenomenon. Secondly, tropical ocean warming is not only happening in the south.
The waters of the United States and Chile also include the eastern Pacific and the western Pacific. No matter where it happens, it will be quick.
It is the strongest signal of climate variation, which will lead to obvious global climate anomalies and lead to many regions in the world.
Now serious natural disasters such as drought and flood.